1) remove older genotype flipping functions and benchmarkers
2) remove direct bezier curve fitters, replace them with log based fitters,
log fitters is robust against numerical problems occured when the number of guide point and smapling resolution is high.
1) add flipping switch for bezier fitter
2) add missing handler for bezier fitter
1) start tracing output files in out/ directory
2) add images to demonstrate elevation of bezier degree of fitting
3) add images to demonstrate the effect of missing genotype values to fitted bezier curve.